The paper summarizes a 10-year study of thunderstorms at Minneapolis by means of electric field signatures at the ground. The analysis considers the frequency of storms, the number of storm hours, and the number of storm days as functions of time of day, day of week, and year. The thunderstorm activity is compared with sunspot cavity, and I conclude that there is little evidence for direct coupling between electrical activity in solar events and thunderstorm events. The analysis includes the drought year of 1976 in this area so that comparisons can be made between this year and other more normal years.